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A 30-mph wind blows at an angle of 8 degrees to the plane of a signboard that is 12ft long by 2 ft wide. Using CL=0.52 and CD=0.09 Calculate the force acting on the signboard at right angles to the wind direction and the force acting parallel to the wind direction. Assume air at 60 degrees F
A refrigerator does 18 kj of work while moving 115 kg of thermal energy from inside the refrigerator. What is its coefficient of performance
q1. a piece of wood is 6.00 m long 0.260 m wide and 0.060 m thick. its density is 600kgm cubed. what volume of iron p
An electron is accelerated from rest through a potential difference that has a magnitude of 3.00x10^7 V. What is the relativistic kinetic energy (in joules) of the electron
A bicycle has wheels with a diameter (DIAMETER, not radius) of 0.620 m. Find the linear acceleration of the bicycle
A conical pendulum is formed by attaching a 0.90kg ball to a 1.0m -long string, What is the ball's angular velocity, in rpm
a heat engine takes in 1000J of energy from a hot reservoir and expels 750J of energy to the cold reservoir in each cycle find the efficiency of the heat engine
The bulk modulus for a given fluid is 1.85E+9 Pa, and the fluid density is 1000.0 kg/m3. What is the bulk modulus of this fluid
During an earthquake, the top of a building oscillates with an amplitude of 30cm at 1.4Hz. What is the maximum acceleration of the top of the building
A 581-{\rm N} physics student stands on a bathroom scale in an 821-{\rm kg} (including the student) elevator that is supported by a cable. Find the magnitude of the acceleration of the elevator
What force does the water exert on the man. explain how far does the tongue reach.
Suppose the space shuttle is in orbit 400 km from the Earth's surface, Find the centripetal acceleration of the space shuttle in its orbit in m/s2
In a particular rear-end car collision the driver's head rotates 45 degrees backward before being stopped by the headrest. What is the average angular velocity of the driver's head
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